{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease", "Chemical"], "input": "Pain was less severe in Groups R4 and R6 than in the control and R2 groups ( P < 0 . 001 ) ."}
{"Disease": ["Pain"], "Chemical": []}